NL8402197A - POLYCARBONATE AND CERTAIN ABS RESIN CONTAINING FORMULAS. - Google Patents

Description

N032597 1

Polycarbooate and some molding compounds containing ABS resin The Applicant lists as inventors: 1. Ulrich R. Grigo 2. Stuart L · Cohen

The invention relates to thermoplastic molding compositions and in particular compositions containing a polycarbonate resin and a graft polymer of a conjugated diene.

The thermoplastic molding compositions according to the invention, consisting of a mixture of a polycarbonate resin, a graft polymer of a conjugated diene and an impact-resistant rubber, are characterized in that the butadiene graft polymer contains at least a small amount of α-methylstyrene and that it contains an improved impact toughness is combined with a good HDT value (mold resistance to heat-10 te).

A mixture of polycarbonate and ABS resin containing compositions are described in U.S. Pat. Nos. 3,130,177 and 3,832,393. Similar masses are described in U.S. Pat. Nos. 3,954,905 and 3,988,389 to have improved weld seam strength.

The improved impact toughness of polycarbonates due to incorporation of a graft elastomer therein has been the subject of numerous U.S. patents, for example, U.S. Pat. Nos. 4,299,928, 4,245,058, Re. 28,723, 4,263,416, 4,263,415, 4,260,693 and 4,082,895 and others.

The polycarbonate resin

The polycarbonate resins to be used in the practice of the invention are homopolycarbonates, copolycarbonates and terpolycarbonates or mixtures thereof. The polycarbonates generally have a molecular weight of 10,000-200,000 (average molecular weight), preferably of 20,000-80,000, and can have a melt flow rate according to ASTM D-I238 at 300 ° C from about 1 to about 24 g / 10 minutes , preferably of about 2-15 g / 10 minutes. They can be prepared, for example, by means of the known two-phase interfacial process from a carbonic acid vessel, such as phosgene, and from dihydroxy compounds by polycondensation (compare German Offenlegungsschrift No. 2,063,050, 2,063,052, 1,570). 703, 2,211,956, 2,211,957 and 2,248,817, French Patent 1,561,518 and Monographic by H. Schnéll, "Chemistry and Physics of Polycarbonates", Interscience 8 4 6 2 1 S 7.

V

2

Publishers, New York 1964).

According to the present invention, dihydroxy compounds suitable for the preparation of the polycarbonates of the invention correspond to the structural formulas 1 or 2, wherein 5 A is an alkylene group with 1-8 carbon atoms, an alkylidene group with 2-8 carbon atoms, a cycloalkylene group with 5-15 carbon atoms, a cycloalkylidene group with 5-15 carbon atoms, a carbonyl group, an oxygen atom, a sulfur atom, a -S0 or -SO2 radical or a radical of the general formula 3 or 4-10, e and g both the numbers 0 or 1 represent ZF, Cl, Br or an alkyl group having 1 to 4 carbon atoms, and when several radicals Z are substituents in an aryl radical, these radicals may be the same or different, 15 d 0 or a whole number from 1-4 and f means 0 or an integer from 1-3.

Bisphenols useful in the practice of the present invention include hydroquinone, resorcinol, bis (hydroxyphenyl) alkanes, bis (hydroxyphenyl) ethers, bis (hydroxyphenyl) ketones, bis (hydro-20 xyphenyl) sulfoxides, bis (hydroxyphenyl) sulfones and α, α-bis (hydroxyphenyl) -diisopropylbenzenes and their nuclear alkylated compounds. These and other suitable aromatic dihydroxy compounds are described, for example, in U.S. Pat. Nos. 3,028,365, 2,999,835, 3,148,172, 2,991,273, 3,271,367, and 2,999,846. Other examples of suitable diphenols are 2,2-bis (4-hydroxyphenyl) propane (bisphenol A), 2,4-bis (4-hydroxyphenyl) -2-methylbutane, 1,1-bis (4-hydro -xyphenyl) -cyclohexane, α, u-bis (4-hydroxyphenyl) -p-diisopropylbenzene, 2,2-bis (3-methyl-4-hydroxyphenyl) -propane, 2,2-bis (3-chloro-4- hydroxy-phenyl) propane, bis- (3,5-dimethyl-4-hydroxyphenyl) methane, 2,2-bis (3,5-30 dimethyl-4-hydroxyphenyl) propane, bis (3,5-dimethyl-4- hydroxyphenyl) sulfoxide, bis (3,5-dimethyl-4-hydroxyphenyl) sulfone, 2,4-bis (3,5-dimethyl-4-hydroxyphenyl) -2-methylbutane, 1,1-bis (3,5-dimethyl 4-hydroxyphenyl) -cylohexane, ά, α-bis (3,5-dimethyl-4-hydroxyphenyl) -p-diisopropylbenzene and 4,4 * sulfonyldiphenyl.

Examples of particularly preferred aromatic bis phenols are 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (3,5-dimethyl-4-hydroxyphenyl) propane and 1,1-bis (4-hydroxyphenyl ) cyclohexane.

The primarily preferred bisphenol is 2,2-bis (4-hydroxyphenyl) propane (bisphenol A).

The polycarbonates according to the invention can contain in their structure 8402197 * r * - 3 units, which are derived from one or more of the suitable bisphenols. Resins suitable for the practice of the present invention include polycarbonates, copolycarbonates, and phenol-based terpolycarbonates, as described in U.S. Pat. Nos. 3,036,036 and 4,210,741.

The polycarbonates according to the invention may also be branched in such a way that small amounts, preferably between 0.05 and 2.0 mol% (based on the amounts of the diphenols used), are condensed as polyhydroxy compounds. Polycarbonates of this type are described, for example, in German Offenlegungschrifts 1,570,533, 2,116,974 and 2,113,374, British Pat. Nos. 885,442 and 1,079,821 and U.S. Patent 3,544,514. Some examples of polyhydroxy compounds that can be used for this purpose are; phloroglucinol, 4,6-dimethyl-2,4,6-tri- (4-hydroxyphenyl) heptane, 1,3,5-tri- (4-hydroxyphenyl) benzene, 1,1,1-tri- ( 4-hydroxyphenyl) ethane, tri- (4-hydroxyphenyl) phenylmethane, 2,2-bis- [4,4- (4,4'-dihydroxyphenyl) cyclohexyl] propane, 2,4-bis (4- hydroxy-1-isopropylidene) ε-nol, 2,6-bis- (21-dihydroxy-5-methylbenzyl) -4-methylphenol, 2- (4-hydro-xyphenyl) -2- (2,4-di -hydroxyphenyl) propane and 1,4-bis [(4f, 4 * - dihydroxy-20-triphenylmethyl] benzene. Some other trifunctional compounds are 2,4-dihydroxybenzoic acid, trimesic acid, cyanuric chloride and 3,3-bis- (4-hydroxyphenyl -2-oxo-2,3-dihydroindole.

In addition to the above polycondensation process, the essential details of which are described below, other processes for the preparation of the polycarbonates of the invention are homogeneous phase polycondensation and transesterification. The suitable methods are described in U.S. Pat. Nos. 3,028,365, 2,999,846, 3,153,008, and 2,991,273.

The preferred process for the preparation of the polycarbonates is the interfacial polycondensation process.

Other methods of synthesis, such as the method described in U.S. Patent 3,912,688, can be used to form the polycarbonates of the invention.

Suitable polycarbonate resins are commercially available, for example under the trade designations Merlon M-39, Merlon M-40 and Merlon M-50, all of which are bisphenol Δ-based polycarbonate resins which differ in molecular weight and are characterized in that their melt index, determined according to ASTM D-1238, 12-24, 6-11.9, respectively. 3.0-5.9 g / 10 minutes. They are all available from the 40 Mobay Chemical Corporation of Pittsburgh, Pennsylvania, U.S.A.

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Graft polymer of a conjugated diene

Within the scope of the invention, graft polymers of ABS conjugated diene resins (acrylonitrile-butadiene-styrene) are characterized in that the content of their rubbery backbone (mainly based on butadiene) is about 1-40 wt. %, preferably 3-30% by weight, and that their grafted phase is the polymerized mixture of monovinyl aromatic monomers and α-alkyl-substituted mono-vinyl aromatic monomers, preferably in a ratio of both of these monomers from about 30/1 to about 1 / 30.

In essence, the molecules of the ABS resins consist of two or more polymeric parts of different composition which are chemically joined together. The graft polymers can be prepared by polymerizing at least one conjugated diene, such as butadiene, or a conjugated diene with a copolymerizable monomer, such as styrene, for the preparation of a backbone (backbone), and then polymerizing at least one graft monomer, at preference of two graft monomers is carried out in the presence of the prepolymerized backbone, thereby obtaining the graft polymer.

As already mentioned, the backbone is preferably a polymer or copolymer of a conjugated diene, such as polybutadiene, butadiene-styrene, butadiene-acrylonitrile or the like.

A specially conjugated diene monomer which can be used in the preparation of the graft polymer backbone (backbone) is generally described by the formula 5 wherein X may be selected from the group consisting of hydrogen, halogen atoms, alkyl groups of 1-5 carbon atoms, chlorine and bromine atoms. Examples of dienes which can be used are butadiene, isoprene, 1,3-hep-tadiene, methyl-1,3-pentadiene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 2-methyl-3-ethyl-1,3-butadiene, 2-ethyl-1,3-pentadiene, 1,3- and 2,4-hexadienes, butadienes substituted by chlorine and bromine such as dichlorobutadiene, bromobutadiene, chloroprene, dibromobutadiene, mixtures thereof and the like. The preferred conjugated diene herein is butadiene.

The grafted phase, polymerized in the presence of the prepolymerized backbone, is characterized in that it comprises a mixture of monomers comprising at least one member from group (i) and (ii) and optionally one or more members from group ( iii) contains: (1)

The group (i) comprises monovinyl aromatic monomers of the formula 6.40 in which Y1-Y7 independently represent a hydrogen, chlorine or 8402197 v bromine atom or an alphyl group with 1-5 C atoms and X represents a hydrogen, chlorine - or bromine atom. Examples of this group include styrene as well as vinyl aromatic compounds substituted by one or more alkyl, cycloalkyl, aryl, alkaryl, aralkyl, alkoxy and / or aryloxy groups. Suitable compounds are preferably styrene, 3-methyl styrene, 3,5-diethyl styrene and 4-n-propyl styrene, α-chlorostyrene, vinyl toluene, α-bromostyrene, chlorophenyl ethylene, dibromophenyl ethene, tetrachlorophenyl ethene, 1-vinyl naphthalene, 2-vinyl naphthalene and mixtures thereof. The first preferred compound of this group is styrene.

(you)

The group (ii) includes a-alkyl-substituted monovinylaromatic monomers of the formula 7 wherein Yg-Yi4 independently represents a hydrogen, chlorine or bromine atom or an alkyl group containing 1 to 5 C-atoms and X represents an alkyl group with 1 to 5 C atoms, for example a methyl group.

(lü)

The group (iii) includes acrylonitrile, substituted acrylonitrile and / or acrylic acid esters represented, for example, by acrylonitrile and al-20 acrylates, such as methyl methacrylate. Acrylonitrile, substituted acrylonitrile, or acrylic acid esters are generally described by the formula 8 wherein independently can be selected from the group consisting of hydrogen atoms, alkyl groups of 1 to 5 carbon atoms, chlorine and bromine atoms, and Z a cyano or 25 represents carbalkoxy group, wherein the alkyl group of the carbalkoxy group contains about 1-12 carbon atoms. Examples of monomers of this type, that is, of acrylonitrile, substituted acrylonitrile or acrylic acid esters of the formula 8, are acrylonitrile, ethacrylonitrile, methacrylonitrile, α-chloroacrylonitrile, fj-chloro-acrylonitrile, α-bromo-30-acrylonitrile, and β-bromo-acrylonitrile. methyl methacrylate, ethyl acrylate, butyl acrylate, propyl acrylate, isopropyl acrylate, isobutyl acrylate, mixtures thereof and the like. The preferred acrylic monomer herein is acrylonitrile and the preferred acrylic acid esters are ethyl acrylate and methyl methacrylate.

Among the butadiene graft polymers useful in the practice of the present invention is the commercially available resin labeled Blendex 702 from Borg Warner Ine. Blendex 702 is characterized by the following chemical composition (approximately): about 15 wt % polybutadiene, about 23 wt% acrylonitrile, about 40 48 wt% styrene and about 14 wt% α-methylstyrene.

8402197

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The means for making it impact resistant

The impact-resistant agents suitable for the practice of the present invention are compounds which are characterized in that they are at least 45 wt%, preferably about 45 wt% to about 98 wt%, based on the weight in each case of the impact-proofing agent, contain an elastomeric phase and furthermore the glass transition temperature of this elastomeric phase is below 20 ° C, preferably below 10 ° C. In principle, any rubber can be used as an elastomeric component of the impact-proofing agent, provided that its properties meet the above criteria. Cross-linking of the rubber elastic phase is an optional feature of the impact resistant agent. Suitable rubber types include homopolyacrylates and copolyarcylates as well as conjugated diene polymers and conjugated diene copolymers.

Particularly suitable rubbers are polybutadiene, butadiene copolymers with a maximum of 30% by weight of copolymerized styrene or acrylonitrile and butadiene copolymers with a maximum of 20% by weight of a low molecular weight alkyl ester of acrylic or methacrylic acid, for example methacrylate, methyl methacrylate and ethyl methacrylate as well as butyl or ethyl acrylate. Also useful are any acrylate-based rubbers, such as alkyl acrylate, in which the alkyl group contains 1-6 C atoms, preferably butyl acrylate. The rubbers of the present invention may contain a "shell" - or grafted phase - of the polymerization product of one or more monomers grafted thereon. The weight ratio between the rubber and the graft polymerization monomers of such embodiments generally ranges from 85:15 to about 45:55.

Grafted impact-proofing agents of this type are known. For example, they can be obtained by polymerizing the monomers on a rubber latex in the presence of a free-radical catalyst and are commercially available, for example, from Bayer AG, Leverkusen, Federal Republic of Germany.

Other suitable graft materials are available under the trade designation Kane Ace B56 from Kanegafuchi, Osaka, Japan, which are an MBS (methacrylate-butadiene-styrene), as well as various other ABS resins.

Acrylic based graft materials include the multi-phase acrylic rubber interpolymer laminate materials disclosed in U.S. Pat. Nos. 3,808,180 and 4,096,202. In summary 40, the technique described therein is a method for the preparation of a specific class of compounds for multi-phase systems. Within the scope of the invention, these compositions are suitable which contain about 45-95% by weight of a first elastomeric phase and about 55-5% by weight of a second rigid thermoplastic phase. The first phase is polymerized from about 75-99.8 wt% q-Ce acrylate, resulting in an acrylic rubber core with a glass transition temperature of less than about 10 ° C, which is 0.1-5 wt% of a cross-linking monomer is cross-linked and to which is added 0.1-5 wt% of a graft-binding monomer.

The preferred alkyl acrylate is butyl acrylate. The cross-linking monomer is a polyethylenically unsaturated monomer having various reactive groups, which can undergo addition polymerization, all of which polymerize at substantially the same reaction rate.

Suitable cross-linking monomers include polyacrylic acid and poly-methacrylic acid esters of polyols, such as butylene diacrylate and dimethacrylate, trimethylolpropane trimethacrylate and the like, di- and trivinylbenzene, vinyl acrylate and methacrylate and the like. The preferred crosslinking monomer is butylene diacrylate. The graft-binding monomer is a polyethenically unsaturated monomer having various groups capable of undergoing addition polymerization, at least one of which polymerizes at a reaction rate substantially different from that of at least one of the other reactive groups. The function of the graft-binding monomer is to provide a residual degree of non-saturation in the elastomeric phase, especially in the later stage of the polymerization and consequently to or near the surface of the elastomer particles. .

Preferred graft-binding monomers are allylmeth acrylate and diallylmaiate.

The last stage monomer system may consist of C 1 -C 8 methacrylates, styrene, acrylonitrile, alkyl acrylates, alkyl methacrylate, dialkyl methacylate and the like, insofar as the Tg is above at least 20 ° G. Preferably, the last stage monomer system is at least 50% by weight of alkyl methacrylate, wherein the alkyl groups contain 1-4 carbon atoms. It is further preferred that the last stage polymer be free of units which tend to degrade poly (alkylene terephthalate), such as, for example, acid, hydroxyl, amino and amide groups.

As particularly suitable in the context of the present invention, a particular acrylic rubber interpolymer laminate may be used in the first place.

¥ ’S

material of a type which is characterized by an n-butyl acrylate acrylic rubber core, 1,3-butylene diacrylate as crosslinking agent used and diallyl maleate as graft-binding agent and methyl methacrylate as monomer system of the second phase.

The composition of the preferred interpolymer compound can be described by the weight ratio of the monomers constituting this compound as follows: n-butyl acrylate / 1,3-butylene diacrylate / diallyl maleate / methyl methacrylate = 79.2 / 0 .4 / 0.4 / 20.0. Such an acrylic rubber interpolymer laminate material is available under the trade designation Acryloid KM-330 from Rohm &

Haas Company of Philadelphia, Pennsylvania, U.S.A.

Suitable impact-proofing agents include MBS (methacrylate-butadiene-styrene graft polymers) and ABS (acrylonitrile-15-butadiene-styrene graft polymers) resins.

The thermoplastic molding compositions according to the invention comprise a mixture comprising 20-95 parts by weight of polycarbonate resin per 100 parts by weight of resin, 3-78 parts by weight of graft polymer per 100 parts by weight of resin and 2-20 parts by weight of the agent for the impact resistant per 100 parts by weight of resin; includes a corresponding phrase of preferred values.

30-80 parts by weight of polycarbonate resin per 100 parts by weight of resin, 10-60 parts by weight of graft polymer per 100 parts by weight of resin and 5-15 parts by weight of the impact-proofing agent per 100 parts by weight of resin .

Among the advantages offered by the compositions of the present invention are thermal resistance in combination with good impact toughness and mold resistance to heat under load. For example, the degree of thermal resistance shows that test specimens formed at about 274 ° C have a mold resistance to heat under a load of 18.20 x 10 ^ N / m ^ of more than 110 ° C and a notched impact strength according to Izod [6.35 mm (1/4 * ') samples according to ASTM D-256] of more than 6.78 J / 25.4 mm (5.0 ft.lb/in).

In addition to the components of the composition according to the invention indicated above, the compositions may also contain mold-removing agents, pigments, dyes, flame retardants, heat and moisture stabilizers as well as fillers and reinforcing agents of known types.

The compositions of the invention are prepared in such a way that the ingredients are mixed dry together and then with agents known and introduced in the art and, as also indicated by way of example below, are extruded and the extruded material is in the form of pellets.

The following examples further illustrate the invention.

5 Examples

Examples I - V

Compositions of the present invention have been prepared and a summary of their properties is set forth below. In the preparation of these compositions, the polycarbonate resin was a bisphenol A homopolycarbonate with a melt index of 3.0-5.9 g / 10 minutes. Acryloid KM-330 - a product of Rohm & Haas Corp. were used as impact-proofing agents. - an acrylic rubber graft polymer with a rubber content of about 80% by weight, and Acryloid KM-653 - also a product of Rohm & 15 Haas Corp. - a graft polymer of methyl methacrylate-butadiene-styrene with a polybutadiene content of about 70% by weight, a styrene content of about 13% by weight and a methyl methacrylate content of about 14% by weight; the polybutadiene based impact stabilizers indicated are characterized both by their polybutadiene content and their SAN graft material, wherein the styrene: acrylonitrile ratio was 72/28. The graft polymer used was Blendex 702. After thorough mixing, the mixture of indicated components was extruded by a twin worm extruder (ZSK 53) at a worm rotation speed of 100-110 minutes. - and a temperature - profile (from back to front) of 270/250/235/240/235/240 ° C extruded with a throughput of 40.8-45.4 kg / hour The quantities of the components are indicated in wt%.

8402197: Φ 10

Table A

Example I 11 ^ TII ^ IV ^

Polycarbonate, wt% 52.0 52.0 52.0 52.0 52.0 5 Graft polymer, wt% 48.0 38.0 38.0 38.0 38.0

Impact fastener, wt% - 10.0 10.0 10.0 10.0

Melt index, g / 10 min. 4.0 4.2 3.0

Elasticity modules, GPa 2.48 2.35 2.13 - -

Flexural Strength, MPa 61.4 56.0 54.7

Max. strength, MPa 97.6 87.2 80.4 - -

Notched impact strength according to Izod, J / 25.4 mm

Samples were formed at 232 ° C

3.18mm 14.5 22.4 17.8 14.1 20.1 6.35mm 7.1 12.9 17.4 11.9 18.8

20, 246 ° G

3.18 mm 12.9 14.9 15.9 13.6 15.5 6.35 mm 6.0 12.2 14.0 10.4 14.4

260 ° C

3.18 mm 11.8 14.6 15.2 13.2 14.2 25 6.35 mm 5.3 12.6 13.4 9.6 17.6

274 ° C

3.18 mm 8.9 13.0 13.8 11.4 12.6 6.35 mm 4.1 10.3 12.5 8.8 14.9 2q Tensile strength, MPa yield 63.5 56.8 53.7 56 .0 54.4 maximum 63.5 56.8 53.7 56.0 54.4 tear 49.8 46.7 48.0 45.6 48.1

Flow elongation,% 33.0 32.0 63.0 5.0 5.0 8402 197 11

Table A - continued (1) CD (2) (2)

Example X XI III IV V

5 Heat resistance of the mold, ° C at 18.20 x 105 N / m2 116.0 115.8 117.7 117.0 117.4

Notched impact strength according to Izod, J / 25.4 mm 10 at -20 ° C 2.6 8.3 10.4 6.6 5.7 at -30 ° C 2.0 · 4.1 4.5 6.0 5 1.4 at -40 ° G 2.3 3.4 4.3 6.9 4.2 ^ The impact-proofing agent of Example IX consists of 50% by weight of polybutadiene and that of Example III of 75% by weight > polybutadiene; the remainder were each SAN, and the average particle size was about 0.3-0.5 µm.

^ Acryloid® KÈf “653 resp. Acryloid ^ Kif-330 were used as impact-proofing agents in Example IV, respectively. Example 20 applied.

It may be instructive to note that the heat resistance of the form of a composition differs only from that of Example I above in that the graft copolymer contained therein does not contain α-methylstyrene (Blendex 206 by Borg Warner) 25 at about 106 ° C.

Examples VI-XIII

Other compositions of the present invention have been prepared and a summary of their properties is set forth below. The components used in this series of examples were the same as those used in the preparation of the compositions of Examples I-V. The added impact stabilizer was Acryloid ™ KM-653. The extrusion [5.08mm (2, f) extruder, compression ratio 2.75: 1, arrangement of the seven 20-40-60-40-20J of the dry mixed components was with a temperature profile (back to front ) of 270/280/270/255/245/265 / 265eC.

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Table B

Example VI VII VIII IX X XI XII XIII

Polycarbonate, wt% 52.0 52.0 52.0 52.0 60.0 60.0 60.0 60.0

Graft polymer, wt% 48.0 38.0 38.0 38.0 40.0 30.0 30.0 30.0

Striking means— 5 / 'i'i v, wt% - 10.0 10.0 10.0 - 10.0 10.0 10.0

Notched impact strength according to Izod, J / 25.4 mm

Samples formed at 232 ° C

3.18 mm 15.1 15.5 15.6 14.8 17.6 16.8 17.6 14.6 6.35 mm 11.5 11.8 12.7 6.6 11.9 12.2 14.1 11 , 9

274 ° C

3.18 mm 10.8 11.8 12.7 10.7 12.2 14.2 15.3 13.0 6.35 mm 3.3 8.3 9.5 7.5 3.9 10.2 11.5 9 , 5

Notched impact strength according to Izod, J / 25.4 mm 2Q at -20 ° C 4.1 9.4 9.1 7.6 9.9 13.8 12.9 10.7 at -30 ° C 3.0 3, 9 6.1 6.4 3.1 4.1 6.9 8.4 at -40 ° C 3.4 3.9 4.20 4.2 4.2 4.1 4.6 4.6

Resistance of the mold 25 to heat, ° C, at 18.20 x IQ * N / m2 115.5 114.9 117.0 114.5 118.6 117.7 119.1 120.2 ^ The means for impact-proofing of the compositions of Examples VII and XI are based on 50 wt% polybutadiene, those of the compositions of Examples VIII and XII are based on 75 wt% polybutadiene; in both cases the remainder was SAN (S / AN - 72/28); Acryloid KM-653 was used in the compositions of Examples IX and XIII.

The advantages achieved by the compositions of the present invention over the prior art compositions can be recognized even more clearly upon a consideration of the following table.

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Table G

con con con con - together con troll trole theorem theorem theorem theorem

5 _A___B__C__X XI XII

Polycarbonate, wt% 60.0 ^ 60.0 (1) 60.0 (1) 60.0 (2) 60, Q * 2) 60.0 ^

Graft polymer, wt% 40.0 (3) 30.0 (3) 30.0 (3) 40.0 (4) 30.0 (4) 30.0 (4)

Impact fastener, wt% 10 a <5> - 10.0 - - 10.0 B (6) - - 10.0 - - 10.0

Notched impact strength according to Izod,

Hon & t £% & AeKagad at 274 ° C

15 J / 25.4 mm 11.8 13.4 13.4 3.9 10.2 11.5 ^ Bisphenol A homopolycarbonate with a melt index of approximately 6-11.9 g / 10 minutes according to ASTM D- 1238.

(2) Bisphenol A based homopolycarbonate with a melt index of about 3-5.9 g / 10 minutes. f3) 1 Dow resin 213, a bulk suspension ABS resin, product of Dow Chemical Corporation, which does not contain α-methylstyrene and is characterized by a content of about 8% by weight of butadiene. f4) v Blendex 702, an α-methylstyrene-containing ABS resin. f5) 25 v J Impact-proofing agent containing 50 wt% polybutadiene grafted with 50 wt% SAN (S / AN * 72/28).

Impact-proofing agent containing 75 wt% polybutadiene grafted with 25 wt% SAN (S / AN * 72/28).

The compositions according to Control A, B and C were used using a ZSK 53 with a rotation speed of 100/110 minutes and a throughput of 40.8-45.4 kg / h at a temperature profile (from back to front) of 270/250/235/240/235/240 ° C.

It is believed that the slight differences between the molecular weights of the polycarbonates of the control samples and those of the compositions X, XI and XII and the differences between the compounding conditions are not critical to illustrating the invention.

The values clearly demonstrate that the high temperature processing of the prior art composition in comparison with the unmodified mixture does not significantly change the the behavior in the impact toughness test caused »that is to say the mixture designated as control A is sufficiently thermally stable at the processing temperature, so that with the addition of an impact-proofing agent it has only a minimal effect on the impact toughness. the mixture of composition X is considerably less stable (the corresponding impact toughness of the sample of 6.35 mm processed at 232 ° G was 11.9 J / 25.4 mm) and due to the addition of an impact agent confirming improvements achieved come to the fore as significant and surprising.

8402197

Claims (8)

Thermoplastic molding compound, characterized in that it consists of a mixture of 5 (i) an aromatic polycarbonate resin, (ii) an impact-resistant agent, characterized in that it comprises at least 45% by weight of an elastomeric phase and the glass transition temperature of this elastomer is below 20 ° C, and (iii) a graft copolymer of a conjugated diene, characterized in that its rubbery backbone content is about 1-40% by weight and that further, the grafted phase thereof comprises the polymerized mixture of monovinyl aromatic monomers and α-alkyl substituted monovinyl aromatic monomers in a ratio of both of these monomers from about 30: 1 to about 1:30. Thermoplastic molding composition according to claim 1, characterized in that in the mixture (I) in an amount of 20-95 parts by weight per 100 parts by weight of resin, (ii) in an amount of 2-20 parts by weight per 100 parts by weight of resin and (iii) is present in an amount of 3-78 parts by weight 20 per 100 parts by weight of resin. Thermoplastic molding compound according to claim 1 or 2, characterized in that (i) is a polycarbonate resin based on bisphenol A. Thermoplastic molding compound according to claims 1-3, characterized in that (iii) contains a polybutadiene content of about 3-30% by weight. Thermoplastic molding composition according to claims 1-4, characterized in that it consists of a mixture of (i) about 30 to about 80 parts by weight of a homopolycarbonate based on bisphenol A per 100 parts by weight of resin, (ii) about 5 to about 15 parts by weight of an impact resisting agent containing about 45-98% by weight of a rubbery phase selected from the group consisting of the homopolyacrylates, copolyacrylates as well as polymers and copolymers of conjugated dienes and having a glass transition temperature of less than 35 ° C per 100 parts by weight of resin and (iii) about 10 to about 60 parts by weight of a butadiene graft copolymer having a polybutadiene content of about 3 to about 30% by weight, and with a grafted phase containing the polymerized mixture of monovinyl aromatic monomers and α-alkyl substituted monovinyl aromatic monomers in a ratio of these 8402197 ψ 16 both from about 30: 1 to about 1:30 per 100 parts by weight of resin, the parts by weight referring to the weight of the mixture. Thermoplastic molding material according to claims 1 to 5, characterized in that the relative amounts of (i), (ii) and (iii) are chosen to confer the thermal stability mass expressed therein. that test specimens formed from the mass at about 274 ° C show the mold's resistance to heat under a load of 18.20 x 10 ^ N / m ^ of at least 110 ° C and an impact strength 10 according to Izod according to ASTM D-256 have 6.35 mm samples of at least 6.78 J / 25.4 mm. Molded article, wholly or partly consisting of thermoplastic molding material according to claims 1-6. • * 84 02 1 9 7 -V- -N- · J_ _2_ / = \ Ί HO OH M η0 / "ΛΙ (Z) f (Z) f 3 (2) d -" CH - CH j ^ CH CH3 n -F ch3 Jl. 1_ CH3 „„ yz% ~ χ xx / x CH3 y £ = C - c = 1 \. I nri / Y X CH3 _6_ Y f / "Y7 y— ^ X — c * cv I I XY Y3 * 5 6 Y4 7 8 Y.8 * .v4-K <Yu = Jys Yi4 * ii 12 84 0 2 1 δ 7